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Characteristics and Nomenclature of Copolymers

Characteristics and Nomenclature of Copolymers

Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...

Characteristics and Nomenclature of Homopolymers

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Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.

Free-Radical Chain Reaction and Polymerization of Alkenes

Free-Radical Chain Reaction and Polymerization of Alkenes

The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...

Types of Step-Growth Polymers: Polyesters

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...

Step-Growth Polymerization: Overview

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

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Pseudo-tetrablock copolymers with ethylene and a functionalized comonomer.

Robert C Coffin¹, Steve J Diamanti, Atsushi Hotta

¹Mitsubishi Chemical Center for Advanced Materials, Department of Chemistry, Institute for Polymers and Organic Solids, University of California Santa Barbara, Santa Barbara, California, USA.

Chemical Communications (Cambridge, England)

|December 18, 2007

Summary

Researchers synthesized pseudo-tetrablock copolymers using ethylene and 5-norbornen-2-yl acetate. This novel synthesis employed a specific nickel-based initiator system for controlled polymerization.

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Area of Science:

Polymer Chemistry
Organometallic Chemistry

Background:

Controlled synthesis of block copolymers is crucial for advanced material properties.
Nickel-based catalysts offer unique reactivity for olefin polymerization.

Purpose of the Study:

To synthesize pseudo-tetrablock copolymers of ethylene and 5-norbornen-2-yl acetate.
To explore the utility of a specific nickel initiator system for this copolymerization.

Main Methods:

Utilized a nickel-based initiator system: (L(i)Pr2)Ni(eta1-CH2Ph)(PMe3)(2).
Employed bis(1,5-cyclooctadiene) nickel (Ni(COD)2) as a co-catalyst.
Performed polymerization of ethylene and 5-norbornen-2-yl acetate.

Main Results:

Successfully synthesized pseudo-tetrablock copolymers.
Demonstrated the efficacy of the chosen nickel initiator system in creating these specific block structures.

Conclusions:

The developed method provides a viable route for synthesizing pseudo-tetrablock copolymers.
This research expands the toolkit for creating complex polymer architectures using nickel catalysis.